The MTH800, MTM800, MTM800E and MTP850 terminals is available with the following encryption possibilities:• Clear (no air interface encryption) without End to End Encryption• TETRA Encryption Algorithm 1 (TEA1) without End to End Encryption• TETRA Encryption Algorithm 2 (TEA2) without End to End Encryption• TETRA Encryption Algorithm 3 (TEA3) without End to End Encryption• Clear (no air interface encryption) with End to End Encryption• TETRA Encryption Algorithm 1 (TEA1) with End to End Encryption• TETRA Encryption Algorithm 2 (TEA2) with End to End Encryption• TETRA Encryption Algorithm 3 (TEA3) with End to End Encryption